Description: <a id="{8ABDFBD8-270C-4270-9A5B-EBF2DE83D01E}" href="https://edg.epa.gov/metadata/catalog/search/resource/details.page?uuid=%7B8ABDFBD8-270C-4270-9A5B-EBF2DE83D01E%7D">Full Metadata</a> This map service group layer displays Estimated Cancer Risk, Estimated Non-Cancer Respiratory Risk, Estimated Ambient Concentration, and Estimated Exposure Concentration for Formaldehyde at the census tract level from USEPA's 2005 National-Scale Air Toxics Assessment (NATA). The original Access tables were downloaded from USEPA's Office of Air and Radiation (OAR) http://www.epa.gov/ttn/atw/nata2005/tables.html. The data classification (quantile) for this map service was developed for USEPA's Community-Focused Exposure and Risk Screening Tool (C-FERST) per guidance provided by OAR.